Added static methods, nested classes and companion object from superclasses.

compiler/testData/diagnostics/tests/scopes/inheritance/nestedVsToplevelClass.kt

@@ -0,0 +1,36 @@
+class X {
+    fun T_X() {}
+}
+
+class Y {
+    fun T_Y() {}
+}
+
+open class A {
+    class X {
+        fun A_X() {}
+    }
+    companion object {
+        class Y {
+            fun A_C_Y() {}
+        }
+    }
+
+    init {
+        X().A_X()
+        X().<!UNRESOLVED_REFERENCE!>T_X<!>()
+
+        Y().A_C_Y()
+        Y().<!UNRESOLVED_REFERENCE!>T_Y<!>()
+    }
+}
+
+class B: A() {
+    init {
+        X().A_X()
+        X().<!UNRESOLVED_REFERENCE!>T_X<!>()
+
+        Y().A_C_Y()
+        Y().<!UNRESOLVED_REFERENCE!>T_Y<!>()
+    }
+}